2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
5 * DRM core CRTC related functions
7 * Permission to use, copy, modify, distribute, and sell this software and its
8 * documentation for any purpose is hereby granted without fee, provided that
9 * the above copyright notice appear in all copies and that both that copyright
10 * notice and this permission notice appear in supporting documentation, and
11 * that the name of the copyright holders not be used in advertising or
12 * publicity pertaining to distribution of the software without specific,
13 * written prior permission. The copyright holders make no representations
14 * about the suitability of this software for any purpose. It is provided "as
15 * is" without express or implied warranty.
17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
32 #include <linux/kernel.h>
33 #include <linux/export.h>
34 #include <linux/moduleparam.h>
37 #include <drm/drm_crtc.h>
38 #include <drm/drm_fourcc.h>
39 #include <drm/drm_crtc_helper.h>
40 #include <drm/drm_fb_helper.h>
41 #include <drm/drm_edid.h>
43 MODULE_AUTHOR("David Airlie, Jesse Barnes");
44 MODULE_DESCRIPTION("DRM KMS helper");
45 MODULE_LICENSE("GPL and additional rights");
48 * drm_helper_move_panel_connectors_to_head() - move panels to the front in the
50 * @dev: drm device to operate on
52 * Some userspace presumes that the first connected connector is the main
53 * display, where it's supposed to display e.g. the login screen. For
54 * laptops, this should be the main panel. Use this function to sort all
55 * (eDP/LVDS) panels to the front of the connector list, instead of
56 * painstakingly trying to initialize them in the right order.
58 void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
60 struct drm_connector *connector, *tmp;
61 struct list_head panel_list;
63 INIT_LIST_HEAD(&panel_list);
65 list_for_each_entry_safe(connector, tmp,
66 &dev->mode_config.connector_list, head) {
67 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS ||
68 connector->connector_type == DRM_MODE_CONNECTOR_eDP)
69 list_move_tail(&connector->head, &panel_list);
72 list_splice(&panel_list, &dev->mode_config.connector_list);
74 EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
77 * drm_helper_encoder_in_use - check if a given encoder is in use
78 * @encoder: encoder to check
80 * Checks whether @encoder is with the current mode setting output configuration
81 * in use by any connector. This doesn't mean that it is actually enabled since
82 * the DPMS state is tracked separately.
85 * True if @encoder is used, false otherwise.
87 bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
89 struct drm_connector *connector;
90 struct drm_device *dev = encoder->dev;
93 * We can expect this mutex to be locked if we are not panicking.
94 * Locking is currently fubar in the panic handler.
96 if (!oops_in_progress)
97 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
99 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
100 if (connector->encoder == encoder)
104 EXPORT_SYMBOL(drm_helper_encoder_in_use);
107 * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
108 * @crtc: CRTC to check
110 * Checks whether @crtc is with the current mode setting output configuration
111 * in use by any connector. This doesn't mean that it is actually enabled since
112 * the DPMS state is tracked separately.
115 * True if @crtc is used, false otherwise.
117 bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
119 struct drm_encoder *encoder;
120 struct drm_device *dev = crtc->dev;
123 * We can expect this mutex to be locked if we are not panicking.
124 * Locking is currently fubar in the panic handler.
126 if (!oops_in_progress)
127 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
129 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
130 if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
134 EXPORT_SYMBOL(drm_helper_crtc_in_use);
137 drm_encoder_disable(struct drm_encoder *encoder)
139 struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
142 encoder->bridge->funcs->disable(encoder->bridge);
144 if (encoder_funcs->disable)
145 (*encoder_funcs->disable)(encoder);
147 (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
150 encoder->bridge->funcs->post_disable(encoder->bridge);
153 static void __drm_helper_disable_unused_functions(struct drm_device *dev)
155 struct drm_encoder *encoder;
156 struct drm_connector *connector;
157 struct drm_crtc *crtc;
159 drm_warn_on_modeset_not_all_locked(dev);
161 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
162 if (!connector->encoder)
166 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
167 if (!drm_helper_encoder_in_use(encoder)) {
168 drm_encoder_disable(encoder);
169 /* disconnector encoder from any connector */
170 encoder->crtc = NULL;
174 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
175 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
176 crtc->enabled = drm_helper_crtc_in_use(crtc);
177 if (!crtc->enabled) {
178 if (crtc_funcs->disable)
179 (*crtc_funcs->disable)(crtc);
181 (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
182 crtc->primary->fb = NULL;
188 * drm_helper_disable_unused_functions - disable unused objects
191 * This function walks through the entire mode setting configuration of @dev. It
192 * will remove any crtc links of unused encoders and encoder links of
193 * disconnected connectors. Then it will disable all unused encoders and crtcs
194 * either by calling their disable callback if available or by calling their
195 * dpms callback with DRM_MODE_DPMS_OFF.
197 void drm_helper_disable_unused_functions(struct drm_device *dev)
199 drm_modeset_lock_all(dev);
200 __drm_helper_disable_unused_functions(dev);
201 drm_modeset_unlock_all(dev);
203 EXPORT_SYMBOL(drm_helper_disable_unused_functions);
206 * Check the CRTC we're going to map each output to vs. its current
207 * CRTC. If they don't match, we have to disable the output and the CRTC
208 * since the driver will have to re-route things.
211 drm_crtc_prepare_encoders(struct drm_device *dev)
213 struct drm_encoder_helper_funcs *encoder_funcs;
214 struct drm_encoder *encoder;
216 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
217 encoder_funcs = encoder->helper_private;
218 /* Disable unused encoders */
219 if (encoder->crtc == NULL)
220 drm_encoder_disable(encoder);
221 /* Disable encoders whose CRTC is about to change */
222 if (encoder_funcs->get_crtc &&
223 encoder->crtc != (*encoder_funcs->get_crtc)(encoder))
224 drm_encoder_disable(encoder);
229 * drm_crtc_helper_set_mode - internal helper to set a mode
230 * @crtc: CRTC to program
232 * @x: horizontal offset into the surface
233 * @y: vertical offset into the surface
234 * @old_fb: old framebuffer, for cleanup
236 * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
237 * to fixup or reject the mode prior to trying to set it. This is an internal
238 * helper that drivers could e.g. use to update properties that require the
239 * entire output pipe to be disabled and re-enabled in a new configuration. For
240 * example for changing whether audio is enabled on a hdmi link or for changing
241 * panel fitter or dither attributes. It is also called by the
242 * drm_crtc_helper_set_config() helper function to drive the mode setting
246 * True if the mode was set successfully, false otherwise.
248 bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
249 struct drm_display_mode *mode,
251 struct drm_framebuffer *old_fb)
253 struct drm_device *dev = crtc->dev;
254 struct drm_display_mode *adjusted_mode, saved_mode;
255 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
256 struct drm_encoder_helper_funcs *encoder_funcs;
257 int saved_x, saved_y;
259 struct drm_encoder *encoder;
262 drm_warn_on_modeset_not_all_locked(dev);
264 saved_enabled = crtc->enabled;
265 crtc->enabled = drm_helper_crtc_in_use(crtc);
269 adjusted_mode = drm_mode_duplicate(dev, mode);
270 if (!adjusted_mode) {
271 crtc->enabled = saved_enabled;
275 saved_mode = crtc->mode;
279 /* Update crtc values up front so the driver can rely on them for mode
286 /* Pass our mode to the connectors and the CRTC to give them a chance to
287 * adjust it according to limitations or connector properties, and also
288 * a chance to reject the mode entirely.
290 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
292 if (encoder->crtc != crtc)
295 if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
296 ret = encoder->bridge->funcs->mode_fixup(
297 encoder->bridge, mode, adjusted_mode);
299 DRM_DEBUG_KMS("Bridge fixup failed\n");
304 encoder_funcs = encoder->helper_private;
305 if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
307 DRM_DEBUG_KMS("Encoder fixup failed\n");
312 if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) {
313 DRM_DEBUG_KMS("CRTC fixup failed\n");
316 DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id);
318 /* Prepare the encoders and CRTCs before setting the mode. */
319 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
321 if (encoder->crtc != crtc)
325 encoder->bridge->funcs->disable(encoder->bridge);
327 encoder_funcs = encoder->helper_private;
328 /* Disable the encoders as the first thing we do. */
329 encoder_funcs->prepare(encoder);
332 encoder->bridge->funcs->post_disable(encoder->bridge);
335 drm_crtc_prepare_encoders(dev);
337 crtc_funcs->prepare(crtc);
339 /* Set up the DPLL and any encoders state that needs to adjust or depend
342 ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
346 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
348 if (encoder->crtc != crtc)
351 DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n",
352 encoder->base.id, drm_get_encoder_name(encoder),
353 mode->base.id, mode->name);
354 encoder_funcs = encoder->helper_private;
355 encoder_funcs->mode_set(encoder, mode, adjusted_mode);
357 if (encoder->bridge && encoder->bridge->funcs->mode_set)
358 encoder->bridge->funcs->mode_set(encoder->bridge, mode,
362 /* Now enable the clocks, plane, pipe, and connectors that we set up. */
363 crtc_funcs->commit(crtc);
365 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
367 if (encoder->crtc != crtc)
371 encoder->bridge->funcs->pre_enable(encoder->bridge);
373 encoder_funcs = encoder->helper_private;
374 encoder_funcs->commit(encoder);
377 encoder->bridge->funcs->enable(encoder->bridge);
380 /* Store real post-adjustment hardware mode. */
381 crtc->hwmode = *adjusted_mode;
383 /* Calculate and store various constants which
384 * are later needed by vblank and swap-completion
385 * timestamping. They are derived from true hwmode.
387 drm_calc_timestamping_constants(crtc, &crtc->hwmode);
389 /* FIXME: add subpixel order */
391 drm_mode_destroy(dev, adjusted_mode);
393 crtc->enabled = saved_enabled;
394 crtc->mode = saved_mode;
401 EXPORT_SYMBOL(drm_crtc_helper_set_mode);
405 drm_crtc_helper_disable(struct drm_crtc *crtc)
407 struct drm_device *dev = crtc->dev;
408 struct drm_connector *connector;
409 struct drm_encoder *encoder;
411 /* Decouple all encoders and their attached connectors from this crtc */
412 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
413 if (encoder->crtc != crtc)
416 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
417 if (connector->encoder != encoder)
420 connector->encoder = NULL;
423 * drm_helper_disable_unused_functions() ought to be
424 * doing this, but since we've decoupled the encoder
425 * from the connector above, the required connection
426 * between them is henceforth no longer available.
428 connector->dpms = DRM_MODE_DPMS_OFF;
432 __drm_helper_disable_unused_functions(dev);
437 * drm_crtc_helper_set_config - set a new config from userspace
438 * @set: mode set configuration
440 * Setup a new configuration, provided by the upper layers (either an ioctl call
441 * from userspace or internally e.g. from the fbdev support code) in @set, and
442 * enable it. This is the main helper functions for drivers that implement
443 * kernel mode setting with the crtc helper functions and the assorted
444 * ->prepare(), ->modeset() and ->commit() helper callbacks.
447 * Returns 0 on success, negative errno numbers on failure.
449 int drm_crtc_helper_set_config(struct drm_mode_set *set)
451 struct drm_device *dev;
452 struct drm_crtc *new_crtc;
453 struct drm_encoder *save_encoders, *new_encoder, *encoder;
454 bool mode_changed = false; /* if true do a full mode set */
455 bool fb_changed = false; /* if true and !mode_changed just do a flip */
456 struct drm_connector *save_connectors, *connector;
457 int count = 0, ro, fail = 0;
458 struct drm_crtc_helper_funcs *crtc_funcs;
459 struct drm_mode_set save_set;
467 BUG_ON(!set->crtc->helper_private);
469 /* Enforce sane interface api - has been abused by the fb helper. */
470 BUG_ON(!set->mode && set->fb);
471 BUG_ON(set->fb && set->num_connectors == 0);
473 crtc_funcs = set->crtc->helper_private;
479 DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n",
480 set->crtc->base.id, set->fb->base.id,
481 (int)set->num_connectors, set->x, set->y);
483 DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id);
484 return drm_crtc_helper_disable(set->crtc);
487 dev = set->crtc->dev;
489 drm_warn_on_modeset_not_all_locked(dev);
492 * Allocate space for the backup of all (non-pointer) encoder and
495 save_encoders = kzalloc(dev->mode_config.num_encoder *
496 sizeof(struct drm_encoder), GFP_KERNEL);
500 save_connectors = kzalloc(dev->mode_config.num_connector *
501 sizeof(struct drm_connector), GFP_KERNEL);
502 if (!save_connectors) {
503 kfree(save_encoders);
508 * Copy data. Note that driver private data is not affected.
509 * Should anything bad happen only the expected state is
510 * restored, not the drivers personal bookkeeping.
513 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
514 save_encoders[count++] = *encoder;
518 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
519 save_connectors[count++] = *connector;
522 save_set.crtc = set->crtc;
523 save_set.mode = &set->crtc->mode;
524 save_set.x = set->crtc->x;
525 save_set.y = set->crtc->y;
526 save_set.fb = set->crtc->primary->fb;
528 /* We should be able to check here if the fb has the same properties
529 * and then just flip_or_move it */
530 if (set->crtc->primary->fb != set->fb) {
531 /* If we have no fb then treat it as a full mode set */
532 if (set->crtc->primary->fb == NULL) {
533 DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
535 } else if (set->fb == NULL) {
537 } else if (set->fb->pixel_format !=
538 set->crtc->primary->fb->pixel_format) {
544 if (set->x != set->crtc->x || set->y != set->crtc->y)
547 if (set->mode && !drm_mode_equal(set->mode, &set->crtc->mode)) {
548 DRM_DEBUG_KMS("modes are different, full mode set\n");
549 drm_mode_debug_printmodeline(&set->crtc->mode);
550 drm_mode_debug_printmodeline(set->mode);
554 /* a) traverse passed in connector list and get encoders for them */
556 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
557 struct drm_connector_helper_funcs *connector_funcs =
558 connector->helper_private;
559 new_encoder = connector->encoder;
560 for (ro = 0; ro < set->num_connectors; ro++) {
561 if (set->connectors[ro] == connector) {
562 new_encoder = connector_funcs->best_encoder(connector);
563 /* if we can't get an encoder for a connector
564 we are setting now - then fail */
565 if (new_encoder == NULL)
566 /* don't break so fail path works correct */
569 if (connector->dpms != DRM_MODE_DPMS_ON) {
570 DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
578 if (new_encoder != connector->encoder) {
579 DRM_DEBUG_KMS("encoder changed, full mode switch\n");
581 /* If the encoder is reused for another connector, then
582 * the appropriate crtc will be set later.
584 if (connector->encoder)
585 connector->encoder->crtc = NULL;
586 connector->encoder = new_encoder;
596 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
597 if (!connector->encoder)
600 if (connector->encoder->crtc == set->crtc)
603 new_crtc = connector->encoder->crtc;
605 for (ro = 0; ro < set->num_connectors; ro++) {
606 if (set->connectors[ro] == connector)
607 new_crtc = set->crtc;
610 /* Make sure the new CRTC will work with the encoder */
612 !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
616 if (new_crtc != connector->encoder->crtc) {
617 DRM_DEBUG_KMS("crtc changed, full mode switch\n");
619 connector->encoder->crtc = new_crtc;
622 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d]\n",
623 connector->base.id, drm_get_connector_name(connector),
626 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
627 connector->base.id, drm_get_connector_name(connector));
631 /* mode_set_base is not a required function */
632 if (fb_changed && !crtc_funcs->mode_set_base)
636 if (drm_helper_crtc_in_use(set->crtc)) {
637 DRM_DEBUG_KMS("attempting to set mode from"
639 drm_mode_debug_printmodeline(set->mode);
640 set->crtc->primary->fb = set->fb;
641 if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
644 DRM_ERROR("failed to set mode on [CRTC:%d]\n",
646 set->crtc->primary->fb = save_set.fb;
650 DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
651 for (i = 0; i < set->num_connectors; i++) {
652 DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
653 drm_get_connector_name(set->connectors[i]));
654 set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
657 __drm_helper_disable_unused_functions(dev);
658 } else if (fb_changed) {
659 set->crtc->x = set->x;
660 set->crtc->y = set->y;
661 set->crtc->primary->fb = set->fb;
662 ret = crtc_funcs->mode_set_base(set->crtc,
663 set->x, set->y, save_set.fb);
665 set->crtc->x = save_set.x;
666 set->crtc->y = save_set.y;
667 set->crtc->primary->fb = save_set.fb;
672 kfree(save_connectors);
673 kfree(save_encoders);
677 /* Restore all previous data. */
679 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
680 *encoder = save_encoders[count++];
684 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
685 *connector = save_connectors[count++];
688 /* Try to restore the config */
690 !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
691 save_set.y, save_set.fb))
692 DRM_ERROR("failed to restore config after modeset failure\n");
694 kfree(save_connectors);
695 kfree(save_encoders);
698 EXPORT_SYMBOL(drm_crtc_helper_set_config);
700 static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
702 int dpms = DRM_MODE_DPMS_OFF;
703 struct drm_connector *connector;
704 struct drm_device *dev = encoder->dev;
706 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
707 if (connector->encoder == encoder)
708 if (connector->dpms < dpms)
709 dpms = connector->dpms;
713 /* Helper which handles bridge ordering around encoder dpms */
714 static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
716 struct drm_bridge *bridge = encoder->bridge;
717 struct drm_encoder_helper_funcs *encoder_funcs;
720 if (mode == DRM_MODE_DPMS_ON)
721 bridge->funcs->pre_enable(bridge);
723 bridge->funcs->disable(bridge);
726 encoder_funcs = encoder->helper_private;
727 if (encoder_funcs->dpms)
728 encoder_funcs->dpms(encoder, mode);
731 if (mode == DRM_MODE_DPMS_ON)
732 bridge->funcs->enable(bridge);
734 bridge->funcs->post_disable(bridge);
738 static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
740 int dpms = DRM_MODE_DPMS_OFF;
741 struct drm_connector *connector;
742 struct drm_device *dev = crtc->dev;
744 list_for_each_entry(connector, &dev->mode_config.connector_list, head)
745 if (connector->encoder && connector->encoder->crtc == crtc)
746 if (connector->dpms < dpms)
747 dpms = connector->dpms;
752 * drm_helper_connector_dpms() - connector dpms helper implementation
753 * @connector: affected connector
756 * This is the main helper function provided by the crtc helper framework for
757 * implementing the DPMS connector attribute. It computes the new desired DPMS
758 * state for all encoders and crtcs in the output mesh and calls the ->dpms()
759 * callback provided by the driver appropriately.
761 void drm_helper_connector_dpms(struct drm_connector *connector, int mode)
763 struct drm_encoder *encoder = connector->encoder;
764 struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
765 int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
767 if (mode == connector->dpms)
770 old_dpms = connector->dpms;
771 connector->dpms = mode;
774 encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
776 /* from off to on, do crtc then encoder */
777 if (mode < old_dpms) {
779 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
780 if (crtc_funcs->dpms)
781 (*crtc_funcs->dpms) (crtc,
782 drm_helper_choose_crtc_dpms(crtc));
785 drm_helper_encoder_dpms(encoder, encoder_dpms);
788 /* from on to off, do encoder then crtc */
789 if (mode > old_dpms) {
791 drm_helper_encoder_dpms(encoder, encoder_dpms);
793 struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
794 if (crtc_funcs->dpms)
795 (*crtc_funcs->dpms) (crtc,
796 drm_helper_choose_crtc_dpms(crtc));
802 EXPORT_SYMBOL(drm_helper_connector_dpms);
805 * drm_helper_mode_fill_fb_struct - fill out framebuffer metadata
806 * @fb: drm_framebuffer object to fill out
807 * @mode_cmd: metadata from the userspace fb creation request
809 * This helper can be used in a drivers fb_create callback to pre-fill the fb's
812 void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb,
813 struct drm_mode_fb_cmd2 *mode_cmd)
817 fb->width = mode_cmd->width;
818 fb->height = mode_cmd->height;
819 for (i = 0; i < 4; i++) {
820 fb->pitches[i] = mode_cmd->pitches[i];
821 fb->offsets[i] = mode_cmd->offsets[i];
823 drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth,
824 &fb->bits_per_pixel);
825 fb->pixel_format = mode_cmd->pixel_format;
827 EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct);
830 * drm_helper_resume_force_mode - force-restore mode setting configuration
831 * @dev: drm_device which should be restored
833 * Drivers which use the mode setting helpers can use this function to
834 * force-restore the mode setting configuration e.g. on resume or when something
835 * else might have trampled over the hw state (like some overzealous old BIOSen
838 * This helper doesn't provide a error return value since restoring the old
839 * config should never fail due to resource allocation issues since the driver
840 * has successfully set the restored configuration already. Hence this should
841 * boil down to the equivalent of a few dpms on calls, which also don't provide
844 * Drivers where simply restoring an old configuration again might fail (e.g.
845 * due to slight differences in allocating shared resources when the
846 * configuration is restored in a different order than when userspace set it up)
847 * need to use their own restore logic.
849 void drm_helper_resume_force_mode(struct drm_device *dev)
851 struct drm_crtc *crtc;
852 struct drm_encoder *encoder;
853 struct drm_crtc_helper_funcs *crtc_funcs;
857 drm_modeset_lock_all(dev);
858 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
863 ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
864 crtc->x, crtc->y, crtc->primary->fb);
866 /* Restoring the old config should never fail! */
868 DRM_ERROR("failed to set mode on crtc %p\n", crtc);
870 /* Turn off outputs that were already powered off */
871 if (drm_helper_choose_crtc_dpms(crtc)) {
872 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
874 if(encoder->crtc != crtc)
877 encoder_dpms = drm_helper_choose_encoder_dpms(
880 drm_helper_encoder_dpms(encoder, encoder_dpms);
883 crtc_funcs = crtc->helper_private;
884 if (crtc_funcs->dpms)
885 (*crtc_funcs->dpms) (crtc,
886 drm_helper_choose_crtc_dpms(crtc));
890 /* disable the unused connectors while restoring the modesetting */
891 __drm_helper_disable_unused_functions(dev);
892 drm_modeset_unlock_all(dev);
894 EXPORT_SYMBOL(drm_helper_resume_force_mode);